Is there an opportunity to leverage similar functionality as offered by Convergence with service.feedback.spam and service.feedback.notspam in general IMAP? I'd like to have either the MMP or the messagestore be able to refer email in the same way when a user is accessing their mailbox with any IMAP client and they move/copy a message to or out of the Spam folder.

yes, but... notice the box at the top
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This information applies to Messaging Server 7 Update 3 and prior versions.
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and part way down the page:
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JmsSample Program
Starting with Messaging Server 7 Update 4 Patch 18, the ens.jar file and sample files have been removed.
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